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<!DOCTYPE html>
<title>flexbox | transitioned flex-basis</title>
<meta name="flags" content="interact">
<style>
div {
width: 20em;
height: 8em;
display: flex;
}
span {
background: yellow;
width: 8em;
flex: 1 1 0%;
}
#test, p+div {
background: #3366cc;
}
div:hover #test {
transition: flex-basis 4s;
flex-basis: 100%;
}
p~div {
margin-right: 1em;
float: left;
display: block;
}
p~div span {
width: auto;
height: 8em;
float: left;
}
p~div~div span {
width: 5em;
}
</style>
<div>
<span>one</span>
<span>two</span>
<span>three</span>
<span id="test">four</span>
</div>
<p>Verify that the box above looks exactly like the second of the boxes
below. Then hover the box above and leave the mouse there for 4 seconds.
After the specified time, the box above should look exactly like the
first of the boxes below.</p>
<div>
<span>one</span>
<span>two</span>
<span>three</span>
four
</div>
<div>
<span>one</span>
<span>two</span>
<span>three</span>
<span id="test">four</span>
</div>